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$\begin{tabular}{|c|c|} \hline Side length, $s$ (inches) & Price, $P$ (dollars) \\ \hline<br/>3 & 8.00 \\ \hline<br/>6 & 18.00 \\ \hline<br/>9 & 28.00 \\ \hline \end{tabular}$ Which of the following could define the relationship between $s$ and $P$ ?